Mechanism for removing wire coating



Sept. 22, 1959 s. J. GARTNER 2,904,803

MECHANISM FOR REMOVING WIRE COATING Filed March 25, 1958 5 Sheets-Sheet 1 INVENTOR Stczrzley clarzner ATTORNEY Sept. 22, 1959 J, NER 2,904,803

MECHANISM FOR REMOVING WIRE COATING INVENTOR Sta/711g cia/r tner ATTORNEY 5. J. GARTNER 2,904,803

MECHANISM FOR REMOVING WIRE COATING 5 Sheets-Sheet 3 Sept. 22, 1959 Filed March 25, 1958 N INVENTOR Stanley (Z Garzzzer BY 'MM/%7/ ATTORNEY Sept. 22, 1959 5. J. GARTNER 2,904,803

MECHANISM FOR REMOVING WIRE'COATING Filed March 25, 1958 5 Sheets-Sheet 4 INVENTOR Stanley cf ariner ATTORNEY S t. 22, 1959 5, GARTNER 2,904,803

MECHANISM FOR REMOVING WIRE COATING Filed March 25, 1958 5 Sheets-Sheet 5 INVENTOR Star/21g cl ar'in/el' ATTORNEY United States Patent 2,904,803 7 MECHANISM FOR REMOVING WIRE COATING Stanley J. Gartner, Emporium, Pa., assignor, by mesne assignments, to Sylvania Electric Products Inc., Wilmington, Del., a corporation of Delaware Application March 25, 1958, Serial No. 723,899

Claims. (Cl. 15--3) This invention relates to coating breakers and in particular to breaking ofi of insulating coatings at the ends of an insulated-filament such as is utilized for heating an electron tube to facilitate welding of the filament by said bared ends to a support.

It is an object of the invention to provide a structure which will remove the coatings in an effective manner and so as to leave the wire thoroughly clean.

This and other objects will become apparent upon considering the following specification when taken in conjunction with the accompanying drawing in which:

Fig. 1 is a plan view of the machine showing the as sembly of an indexible coil holder and the coating breaker. a

Fig. 2 is a side elevation of the coating breaker.

Fig. 3 is a front elevational view of the coating breaker.

Fig. 4 is a section on the line 4--4 of Fig. 2 looking upward toward the coating breaker.

Fig. 5 is a cross sectional view taken on the line 55 of Fig. 2.

Fig. 6 is a cross sectional view on the line 6-6 of Fig.f2.

Fig. 7 isa cross sectional view Fig. 2.

Fig. 8 is a sectional view taken on the line 88 of Fig. 1.

Fig. 9 is a sectional view taken on the line 9-9 of Fig. 1.

Fig. 10 is a section taken on the line 10--10 of Fig. 1.

Fig. 11 is a detail of the coating breakers looking upwards along the line 1111 of Fig. 10 and Fig. 12 is a section through one of the breakers taken on the line 12-12 of Fig. 11. 7

Referring to the drawings in greater detail, at 10 and 12 are bolted together casings forming a housing for most of the instrumentalities which operate the coating breakers.

Atop the upper casing 10 is an electric motor 14 whose shaft 16 extends down into the casing.

Fixed on the lower end of the shaft is an eccentric collar 18, secured thereto by a clamp bar 20. The'eccentric periphery of the collar has a groove 21 to accommodate the clamp bar 22 of a pin holder 24, centrally holding a pivot pin 26 through the intermediary of a ball bearing 28. The lower end of the pin is fixed to a wobble arm 30. The eccentricity of the pin 26 relative to the shaft may be varied by fastening the holder 24 to the eccentric collar at the desired angular position, the thickness of the wall of the collar about the shaft 16 being variable. v

The wobble arm 30, see Fig. 5 reciprocates and oscillates between an adjustably fixed pivot roller 32 and a pair of follower rolls 34' and 36. The roller 32 is fixedly mounted on a ,bar 38 provided with slots 40 at the ends thereof through which bolts 42 with washers 44 thereon are passed to adjustably hold the bar'to the upper casing 10. The adjustment of the bar 38 shifts the pivot roller 32 along the length of arm 30 and since on the line 77 of Patented Sept. 22, 1959 the pin 26 is eccentrically driven, the wobble arm 30 pivots variably as determined by the position of the roller 32. The two rolls 34 are mounted in ears on tool holders 46, each supporting a coating breaker 48. Each tool holder 46 is longitudinally reciprocable in a channel 49 within a slide 50 or 51 each reciprocatable in a direction perpendicular to the reciprocatory movement of the holders '46 and each slide has a slide arm 52 slidable in a slideway 54 in the under side of the upper casing. The slides 50 and 51 are urged toward' each otherby springs 56 lying in bores in the arms 52 and reacting against end plates 58 fastened to the upper and lower casings and assisting in holding these casings together. Retainer plates 60 maintain the slides in the slideway in the upper casing and cover plates 62 cover the slideways 49 to maintain the tool holders in the slides 50 and 51.

. Each cover plate 62 has fixed thereto a depending pin 64 projecting into a longitudinal recess 66 in the associated tool holder, and a spring 68 reacting between the pin and the end wall of the recess resiliently urges the tool holder toward the wobble arm. The motor 14 rotates at a high speed, as at 3600 r.p.m., thereby rapidly vibrating the arm 30 about the pivot roller 32 to cause rapid longitudinal vibratory movements ofthe tool holders. The degree of longitudinal displacement of the tool holders is dependent on the eccentricity of the pivot pin 26 and on the position of the pivot roller 32, while the ratio of longitudinal displacements of the tool holders is a function of the position of the pivot roller 32 as determined by adjustment of the bar 38.

The tool holder portions of the slides 50 and 51, see Figs. 6 and 10, he in a large recess 70 in the underside of the upper casing and may be spread'apart against the action of springs 56 by a wedge bar 72. The wedge bar slides longitudinally in a slideway 74 and is quite thick in its vertical dimension. At its forward end the upper portion of the bar is cut away to form. a wedge 76 with vertical converging sides. The'lower portion of the bar is provided with an axial bore 78 housing a spring 80 which reacts against a wall of the casing 12. The wedge 76 can be thrust in between a pair of rollers 82 below the slides 50 and 51 and mounted on'pins 84 fastened to and extending below the slides. Fastened in the rear end of the Wedge bar and extending thereabove is a cam follower 86 in the form of a pin having its upper end semicircular in shape with the flat diametrical portion 87 of the pin extending longitudinally of the wedge bar. This pin is pressed against the periphery of a split cam 88 by the spring 80.- The cam 88 has an active portion 89 whereat the cleaning of the coated wire is taking place and which has a wall to cause a sharp drop of the pin as indicated at 90 with'a second active shallow dip 92 for a purpose to be described; the remainder of the cam presents a dwell periphery. The cam isfixed on a vertical shaft 94 journalled in the lower casing 12 and driven in synchronism with the main drive for a turret 96 which compacts and supports the insulated Wires which are to be stripped in parts of its coating. For further details of theturret and associated mechanism including the means for vertically reciprocating the coating breaker see the application of James M. Smith for Heater Working Machine and Method, Serial No. 706,058, filed December 30, 1957. When the wall'90 comes into alignment with the flat of the pin 86 the wedge will be suddenly withdrawn from between the rollers 82 and the coating breakers 48 will come'in'sud-.

den contact with the insulating coating on the-heater wire and chip the same. Meanwhile, since the motor v14 is in continuous operation, thebreakers Willbe vibrated dexing of the turret which carries the wires to beneath the breakers, the breakers are maintained separated by the flat pin riding on the dwell or high portions of the cam. At the same time, the entire casing structure 10, 12 and parts carried thereby are raised by means disclosed in the referred to Smith disclosure to allow for indexing of the turret carried insulating wires beneath the breakers. The second low portion 92 of the cam allows the, Wedge to be partially withdrawn from between the rolls to allow the breakers to approach sufficiently close to be cleaned by a brush 100 as will be described.

Adjustable stop means, see Figs. 7 and 10, are provided to limit the approach movement of the breakers so that while the coating on the wires may be broken by impact of the breakers on the coated wire, the wire itself will not be deformed to any marked degree. The stop means includes an adjustable finger 102 with tapered sides 104. and upstanding fork 106. An arcuate guard 109 for the cam 88 is fastened to the lower casing 12. In the upper casing is a threaded bore 110 to receive a screw 112 cooperating with the fork 106 to shift the finger 102 longitudinally. The finger is guided in its movement by a clamp 107 fastened in any suitable manner to the underside of casing to hold the finger in adjusted position and a strap 108 also fastened to the underside of the casing 10 to guide the finger. The lower side faces of the slides 50 and 51 are provided with angled undercuts 114 to cooperate with the tapered sides of the finger. When the slides are driven toward each other, the approach movement of the breakers will be limited by the angled undercut portions engaging the tapered sides 1 0.4 of the finger 102. The finger is adjusted so that the breakers will crush the coating on the Wire to. be stripped of coating but will not effect deformation of the wire by too close approach of the breakers or slides toward each other. To prevent dust. and dirt from entering the recess 70 in which the slides are positioned, there is. provided a flexible dust shield 116 of rubber or the like, closely embracing the tool holders 46 and held to the front portions of the casings 10 and 12 by a rectangular frame 118. The tool holders project through the dust shield and are forked at their free ends as. indicated at 120 and carry the breakers 48 by means of bolts 122 passing through the forks 120 of the tool holders, the bolts holding the blocks tightly against thetool holders. The breakers 48 each comprises a pair of hard steel rectangular blocks 123 each block being loosely mounted in a support 124 by a pin 125 and spring pressed outwardly by a spring 126.

On the underside of casing 12 is a pair of integral collarsin which are fastened two vertical shafts 127. These shafts are vertically reciprocated in timed relation with the indexing of the turret, the shafts rising prior tostart of turret indexing and descending substantially as an in-- dex operation of the turret is completed. This is to permit the breakers to be properly positioned relative to the wires being treated.

Cooperating with the breakers to clean the same on the rise of the shafts 127' is the previously referred to brush 100. Thisbrush is fixed on a horizontal shaft 128 jonr-naled in one end of a cantilever 129whose otherend is fixed tothe base of the machine. The motor 14 atop the upper casing, at its upper end drives a pulley-130 connected bya belt 132 to a second pulley 134 fixed onshaft 128. When the casings10 and 12 with its motor 14. are elevated, the belt 132 is tightened and drives the brush 10.0. At this time the brush'is between the pairs of blocks.- 123 which. are then fairly close to each other, as determined by: the portion 92'of the cam 88. When the.casings 10 and 12'. are lowered the blocks leave the brush, are opened wide topass the wire held in the turretjaws and then snap against the coating on flIG'Wi 'QS 4 as the cam 88 brings the sharp drop before the cam follower pin 86. If desired a spring pressed idler pulley may be pressed against the belt 132 to pick up the slack as the pulley approaches the pulley 134 on the downward movement of the casings.

What is claimed is:

1. Means for removing a coating from a wire comprising a casing, a pair of breakers arranged in parallel spaced relationship supported by said casing, means to vibrate the breakers in opposite parallel directions with respect to each other to remove coating material from wires held between the breakers, means to urge the breakers toward each other and to limit the approach movement of the breakers toward each other and means to separate the breakers to admit of their straddling a Wire and its coating, means to raise and lower the breakers, a brush in the path of vertical movement of the breakers and positionable between the breakers on rise thereof, and means to drive the brush.

2. Means for removing a coating from a wire comprising a casing, a motor mounted on the casing, an eccentric within the casing driven by said motor, a reciprocatable and oscillatable bar coupled to said eccentric, a pivot cooperating with said bar along which said bar slides and on which it pivots, a pair of blocks each carrying a wire engaging member on one end thereof and a follower on the other end thereof, yielding. means urging. the followers against the oscillatable bar, and yieldable means urging the wire engaging members toward each other.

3. Means for removing a coating from a wire comprising a casing, a motor mounted on the casing, an eccentric within the casing drivenby said motor, a reciprocatable and oscillatable bar coupled to said eccentric, a pivot cooperating with said bar along which said bar slides andon which it pivots, a pair: of blocks each carrying a wire engaging member on one end thereof and a follower on the other end thereof, yielding means urging the followers against the oscillatable bar, yield ablemeans urging the wire engaging members toward each other, and cyclic means for periodically separating said members from each other, said means allowing said members to suddenly approach each other during its cycling.

4. Means for removin a coating from a wirecomprising a casing, amotor mounted on the casing, an eccentric within the casing driven by said motor, a reciprocatable and oscillatable bar coupled to said eccen-- tric, a pivot cooperatin with said bar along which said bar slides and on which it pivots; a pair of blocks each carrying a wire engaging member on one end' thereof and a follower on the other end thereof, yielding means urging the followers against the oscillatable bar, yieldable means urging the wire engaging members toward each other, and stop means limitingthe approach movement of said members-toward each other.

5'. Means for removing a coating" from a'wire' comprising a casing, a. motor mounted on the casing, an eccentric within the casing drivenby* saidmotor, areciprocatable and oscillatable bar coupled to said eccentric, a pivot adjustably positionable in the direction oflengthof the bar and cooperating with said bar' alongwhichsaid bar slides'an'd on whichit pivots, a pairof blocks each carrying a wire engaging member on one end thereof and a follower on the other end thereof, yielding means urging the follower against the oseillatable bar, and yieldable means urging the wire engaging members toward eachother.

References Cited inthe file of this patent UNITED STATES PATENTS 1,930,219 Zimber Oct. 10', 1933 

